How do I define my own delimiters to e.g. enable automatic rendering of dirac bra - ket notation?

[SillyFreak]

I could imagine that it’s possible to do this. if you look at repr($ ... $) you can see that you have all the information that you’d need available – but the code to do it likely wouldn’t be pretty. Here’s an example of a smaller syntactical feature that I did:

Adjustable greed in math parsing?

To prove this point – you could (although I don’t recommend it) change the f_n(x) behavior like this: // replace all attach occurrences (a_b, a^b, etc.) #show math.attach: it => { // we'll need the sequence content type let sequence = [].func() // extract base and bottom attachment let (base, b, ..fields) = it.fields() // if the bottom attachment is not of the form b(c), don't do anything if b == none or b.func() != sequence or b.children.len() != 2 or b.children.last().func() !…

… and the transformation necessary for bra-ket syntax would be more complex.

I can’t implement this right now, but maybe either you’re inspired by that other post, or someone else is motivated